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19-477: BDB may refer to: Science and technology [ edit ] 1,3-Benzodioxolylbutanamine (also BDB), an entactogenic drug of the phenethylamine chemical class Berkeley DB , a discontinued embedded database software library for key/value data Bharat Diamond Bourse , the world's largest diamond bourse Big dumb booster , a general class of launch vehicle Media and publications [ edit ] "B D B",

38-601: A fork of the 2013 version of BDB within their Comdb2 database, under the original Sleepycat permissive license . Berkeley DB originated at the University of California, Berkeley as part of BSD , Berkeley's version of the Unix operating system. After 4.3BSD (1986), the BSD developers attempted to remove or replace all code originating in the original AT&T Unix from which BSD was derived. In doing so, they needed to rewrite

57-745: A dbm interface, even though it would be trivial to wrap one: As of 2001, the ndbm implementation of DBM was standard on Solaris and IRIX, whereas gdbm is ubiquitous on Linux . The Berkeley DB implementations were standard on some free operating systems. After a change of licensing of the Berkeley DB to GNU AGPL in 2013, projects like Debian have moved to LMDB. A 2018 AFL fuzzing test against many DBM-family databases exposed many problems in implementations when it comes to corrupt or invalid database files. Only freecdb by Daniel J. Bernstein showed no crashes. The authors of gdbm, tdb, and lmdb were prompt to respond. Berkeley DB fell behind due to

76-417: A library, any application linking to it must be under an AGPL-compatible license. Many open source applications and all closed source applications would need to be relicensed to become AGPL-compatible, which was not acceptable to many developers and open source operating systems. By 2013 there were many alternatives to BDB, and Debian Linux was typical in their decision to completely phase out Berkeley DB, with

95-482: A logging system for transactions and recovery, called "Transactional Data Store" (TDS). The 4.x releases added the ability to replicate log records and create a distributed highly available single-master multi-replica database. This is called the "High Availability" (HA) feature set. Berkeley DB's evolution has sometimes led to minor API changes or log format changes, but very rarely have database formats changed. Berkeley DB HA supports online upgrades from one version to

114-542: A more practical solution for high-speed storage accessed by key, as they do not require the overhead of connecting and preparing queries. This is balanced by the fact that they can generally only be opened for writing by a single process at a time. An agent daemon can handle requests from multiple processes, but introduces IPC overhead. The original AT&T dbm library has been replaced by its many successor implementations. Notable examples include: The following databases are dbm-inspired, but they do not directly provide

133-536: A preference for the Lightning Memory-Mapped Database (LMDB). DBM (computing) In computing, a DBM is a library and file format providing fast, single-keyed access to data. A key-value database from the original Unix , dbm is an early example of a NoSQL system. The original dbm library and file format was a simple database engine , originally written by Ken Thompson and released by AT&T in 1979. The name

152-725: A record. Berkeley DB puts no constraints on the record's data. The record and its key can both be up to four gigabytes long. Berkeley DB supports database features such as ACID transactions , fine-grained locking , hot backups and replication . The name "Berkeley DB" is used by Oracle Corporation for three different products, only one of which is BDB: BDB was once very widespread, but usage dropped steeply from 2013 (see licensing section ). Notable software that still uses Berkeley DB for data storage include: Open-source operating systems and languages such as Perl and Python still support old BerkelyDB interfaces. The FreeBSD and OpenBSD operating systems ship Berkeley DB 1.8x to support

171-409: Is a three-letter acronym for DataBase Manager , and can also refer to the family of database engines with APIs and features derived from the original dbm . The dbm library stores arbitrary data by use of a single key (a primary key ) in fixed-size buckets and uses hashing techniques to enable fast retrieval of the data by key. The hashing scheme used is a form of extendible hashing , so that

190-589: Is different from Wikidata All article disambiguation pages All disambiguation pages Berkeley DB BDB was commercially supported and developed by Sleepycat Software from 1996 to 2006. Sleepycat Software was acquired by Oracle Corporation in February 2006, who continued to develop and sell the C Berkeley DB library. In 2013 Oracle re-licensed BDB under the AGPL license and released new versions until May 2020. Bloomberg L.P. continues to develop

209-413: Is not based on a server/client model, and does not provide support for network access – programs access the database using in-process API calls. Oracle added support for SQL in 11g R2 release based on the popular SQLite API by including a version of SQLite in Berkeley DB (it uses Berkeley DB for storage). A program accessing the database is free to decide how the data is to be stored in

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228-508: The dbopen() operating system call used by password programs such as pwb_mkdb . Linux operating systems, including those based on Debian, and Fedora ship Berkeley DB 5.3 libraries. Berkeley DB V2.0 and higher is available under a dual license : Switching the open source license in 2013 from the Sleepycat license to the AGPL had a major effect on open source software. Since BDB is

247-474: The Netscape browser . That request led to the creation of Sleepycat Software . This company was acquired by Oracle Corporation in February 2006. Berkeley DB 1.x releases focused on managing key/value data storage and are referred to as "Data Store" (DS). The 2.x releases added a locking system enabling concurrent access to data. This is what is known as "Concurrent Data Store" (CDS). The 3.x releases added

266-494: The Unix database package. Seltzer and Yigit created a new database, unencumbered by any AT&T patents: an on-disk hash table that outperformed the existing dbm libraries. Berkeley DB itself was first released in 1991 and later included with 4.4BSD. In 1996 Netscape requested that the authors of Berkeley DB improve and extend the library, then at version 1.86, to suit Netscape's requirements for an LDAP server and for use in

285-487: The hashing scheme expands as new buckets are added to the database, meaning that, when nearly empty, the database starts with one bucket, which is then split when it becomes full. The two resulting child buckets will themselves split when they become full, so the database grows as keys are added. The dbm library and its derivatives are pre- relational databases  – they manage associative arrays , implemented as on-disk hash tables . In practice, they can offer

304-807: The licensing terms have led to its use in a multitude of free and open-source software . Those who do not wish to abide by the terms of the GNU AGPL, or use an older version with the Sleepycat Public License, have the option of purchasing another proprietary license for redistribution from Oracle Corporation . This technique is called dual licensing . Berkeley DB includes compatibility interfaces for some historic Unix database libraries: dbm , ndbm and hsearch (a System V and POSIX library for creating in-memory hash tables ). Berkeley DB has an architecture notably simpler than relational database management systems . Like SQLite and LMDB , it

323-615: The next by maintaining the ability to read and apply the prior release's log records. Starting with the 6.0.21 (Oracle 12c) release, all Berkeley DB products are licensed under the GNU AGPL . Previously, Berkeley DB was redistributed under the 4-clause BSD license (before version 2.0), and the Sleepycat Public License, which is an OSI -approved open-source license as well as an FSF -approved free software license . The product ships with complete source code, build script, test suite, and documentation. The comprehensive feature along with

342-575: The private sector Other uses [ edit ] Bundaberg Airport , IATA airport code "BDB" Topics referred to by the same term [REDACTED] This disambiguation page lists articles associated with the title BDB . If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=BDB&oldid=1190818063 " Category : Disambiguation pages Hidden categories: Articles containing German-language text Short description

361-540: The seventh song on Duke Ellington and Count Basie 1961 album First Time! The Count Meets the Duke Brown–Driver–Briggs , a standard reference for Biblical Hebrew and Aramaic Companies and organizations [ edit ] Banc De Binary , an Israeli financial firm with a history of regulatory issues on three continents Bundesverband deutscher Banken , the Association of German Banks in

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